Multiple fuse



' May 26, 1925. 1,539,404

- H. NQTHDURFT MULTIPLE FUSE Filed may 2, 1924 ATTORNEY Patented Ma 26, 1925.

HENNING ivo'rnnonr'r, or RICHMOND HILL, NEW YORK.

MULTIPLE FUSE.

Application filed May 2,

To all whom it may concern:

Be it known that I, HENNING NOTHDURFT, citizen of Germany, and resident of Richmond Hill, in the county of Queens and State of New York, have invented certain.

new and useful Improvements in Multiple Fuses, of which the following is a speci fication.

This invention relates to multiplefuses in general and particularly to the kind commonly known as fuse plugs or fuse cartridges.

The prime object of my invention is to provide a multiple fuse plug which will not only have the-advantage of permitting the use of such a plug a number of times with 'the upper ends in enlarged cavities 12.

out necessitating the changing of the plug itself, but which has provisions for indicating that portion of the fuse which has been used up. I

Another object of myinvent-ion is to provide a multiple fuse plug of simple, inexpensive and electrically perfect construction adapted to be equipped for use for any current strength, depending upon the size of fusible elements employed.

Another object of my invention is to provide means whereby individual contact made with each one of the fusible elements is assured by broadening the contact surface, thus preventing the formation of a gap which would be detrimental to the proper working of the device.

The foregoing and further objects will be more fully apparent from the following description and the accompanying drawings showing few of the preferred forms, employing my principle of construction. Referring to the drawings, Figure 1 represents a top view of my device partially broken off.

Figure 2 is a partial cross sectional view through Figure 1, taken on line 2-2.

, I Figure 3 is a modified form of my device.

Figure 4 is another modified form of my device.

Figure 5 is a partial top view of the modified form shown in Figure 3.

, Referring to the figures, 1 and 2, numeral 10 denotes a solid body portion of my device which is provided with a plurality of longitudinal ducts indicated at 11 terminating at The lower portion of the body is provided with an external thread 13, whlch may either be of the material of the body or may 1924. Serial No. 710,598. 7 i

thread shape. I

Through the center of the body, there is be made by pouring around the lower por tion plaster of "Paris or otherv hardening cements and imparting thereto, the desired provided a hole 14. Ducts 11 are preferably staggered and serve for receiving a fusible element indicated at 15, the lower end 16 of which is bent towards the center of the plug while the upper end 17 is broadened, and may be thus formed by ouring into the cavity 12, a small quantity 0 solder. Through each duct 11, passes one fusible element and the lower ends of all the elements are shown to be connected by a conductive washer 18,-while the upper ends of the elements are electrically insulated.

Above the broadened ends of the elements, there is disposed a conductive disc-shaped member 19 provided with a plurality of perforations 20 which are internally threaded so as to accommodate athreaded contacting pin; 21, provided with a knob 22. Conductivefmember :19 has a central opening 23.

On top of the conductive member, there is provided a thin, perforable sheet 24 which ber and registering with the cavities 12.

The conductive member 18 connecting the lower ends of the fusible elements is so arranged as to be clampedtight when a threaded outer shell 27 is associated with the 'body of the fuse.

In this way, connection is made between the outer shell and the fuse elements. An insulating washer 28 is shown to be placed centrally at the lower end of the fuse plug and against this insulating washer 28, rests another metallic washer 29, adapted to facilitate the tightening together of the different parts.

This is accomplished by inserting a bolt I 30 through the opening 14 of the body, said bolt being threaded at its end indicated at 31 and engaged by a nut 32.

A similar construction is shown in Fig ures 3 and 5, there, however, the body por tion 10 is hollow and is adapted to receive a solid filamentvcarrier 33. This carrier is provided with longitudinal grooves 34: and enlarged recesses 35; the latter dividing the broadened end of the carrier into ribs 36 as seen in Figure 5.

The grooves 3i are adapted to receive the fusible elements 15' which are bent over at the lower end 16 and broadened at the upper end 17'. The broadened end rests within the recesses 35.

Again a conductive member 19, a piercable sheet 24 and a non-conductive plate 25' are employed, as in the design described before.

The lower ends of the fusible elements are electrically connected by means of a ring 18 which again is held tight by means of threaded shell 27. A washer 28 and a bolt 30 is employed for holding the parts together. I

It will be seen that in this construction, the manufacture ofthe article is greatly cheapened since it requires considerably less time to place the fusible elements in the de vice. In this way, the assembling operations are greatly simplified.

Figure 4 illustrates another form of my device, in which the fusible elements 15- are made in one piece .with the ring-shaped disc 18".

The body member 10" consists of a hollow, substantially cylindrical portion, adapted to support within a filament carrier 33' upon which again reposes a conductive member 19", a perforable sheet 24" and a nonconductive member 25".

Again,.a washer 28" is employed and all the parts are held together by means of a bolt 30". The fusible elements in this case are insulated by means of a powder or dry sand indicated at 37, which is filling the place between the bottom portion of the device and the filament carrier 33'.

Contact with the outer shell 27" is made in the same manner as described in the formerly described figures.

In each construction, the main feature of employing a pierceable element is clearly seen. In use, the plug is inserted into the socket and pin 21 is then placed into one of the apertures provided in the insulated plate 25, 25 or. 25" respectively. v

The sheet 24' or 24" is then pierced by the pin, thereby permitting the pin to engage the thread of the openings in the conductive member 19, 19' or 19". The pin is screwed tight against the broadened portion of the fusible element so as to make perfect contact.

In thisway, contact is made between the nut of the central bolt through the conductive member 19, the pin 21 and one fusible element and the outer threaded shell 27.

When one of the fuses burns out, another fuse may be used in the aforementioned manner.

It is evident that by removing pin 21 from the aperture of the burned out fuse, the hole pierced into the sheet :24: remains thereby indcating that that fusible element has been use It may be desired in some cases that the fuse be employed in circuits of higher amperage, in which case two or more pins may be simultaneously inserted in various aper: tures provided in the plates, in which way, the fuse is capable of carrying a higher current.

Vhile I have shown a specific form of my device, be it understood that improvements and alterations in the design may be made without departing from the broad scope of my invention, for which I claim:

1. A multiple fuse comprising a dielectric body, dielectric .fuse receiving means arranged within said body, a plurality of fusible elements associated with said fuse 'receiving means for electrically uniting one end of.

all elements, a conductive member disposed above said fuse receiving means and provided with means for facilitating making individual connection with the other ends of said elements, and means disposed above said conductive member and adapted to be broken before contact is made between said conductive member and said other ends of an element, and serving for indicating which of said elements has been used.

2. A multiple fuse, comprising a dielectric body, dielectric fuse receiving means within said body. a plurality of fusible elements conductively connected together at one of their ends, said fuse receiving means separating the other ends of said elements','a conductive member disposed above and electrically separated from said other ends of said elements, means for effecting conductive contact between said conductive member and the separated end of one element. a perforable sheet disposed above said conductive member and adapted to be pierced before permittingthe making of contact between said conductive member and one of the sepa- Ir a rated element ends.

3. A multiple fuse. comprising a dielectric body, dielectric fuse element receiving means arranged within said body. a plurality of electrically separated fuse elements carried by said receiving means and electrically joined atone of their ends, the free end of each element provided with an enlargement, a conductivemember disposed above. the enlarged ends of the said elements and insu lated from the latter and provided with means for receiving a contact making member, a perforable sheetarranged above said conductive member. and adapted to be pierced by said contact making member. and a dielectric covering member arranged over said sheet and adapted to allow the insertion of said contact making member.

4;. A multiple fuse, comprising a dielectric body, dielectric fusible element receiv ing means arranged within said body, and provided with a plurality of cavities, a pluralitv of fusible elements carried by said receivinp means and having one of their ends enlarged. saidenlarged ends adapted to engage said cavities, the other ends of said elements adapted to be interconnected with each other. a perforated conductive member, disposed above said fusible element receiving means. the perforations of said conductive member arranged over the said cavities and provided with a thread. a perforable solid sheet secured above said conductive member, an insulating disc provided with perforations holding said sheet in place, the perforations of said insulating disc registering with said cavities of said receiving means,

a threaded pin adapted to be inserted through the perforations of said disc, pierce said sheet, engage the threaded perforations of said conductive member and engage and make contact with said enlarged ends of said fusible elements.

The combination with a multiple fuse, including a plurality of fusible elements interconnected a! one end and means for making'individna] electric connection at the other end of said elements. of a used fuse indicating means comprising a brealmble member disposed over the individual ends of said elements and adapted to be punctured before electric contact may be made. with the individual ends of said elements.

Signed at- Xew York in the county of New York and State'of New York this 21st day of April A. D. 1924,

HENNING NOTHDURFT. 

